ilog.views.graphlayout

Class IlvGraphLayoutLinkProperty

java.lang.Object

ilog.views.IlvNamedProperty

ilog.views.graphlayout.IlvGraphLayoutLinkProperty

All Implemented Interfaces:

IlvPersistentObject, Serializable

Direct Known Subclasses:

IltLinkLayoutLinkProperty, IltShortLinkLayoutLinkProperty, IlvBasicLinkStyleLayoutLinkProperty, IlvHierarchicalLayoutLinkProperty, IlvLinkLayoutLinkProperty, IlvLongLinkLayoutLinkProperty, IlvShortLinkLayoutLinkProperty, IlvTreeLayoutLinkProperty

public class IlvGraphLayoutLinkProperty
extends IlvNamedProperty

The class IlvGraphLayoutLinkProperty allows you to store the settings of an instance of IlvGraphLayout for an individual link as a named property in the link. This is used by IlvGrapherPropertyAdapter.saveParametersToNamedProperties(IlvGraphLayout, boolean) which is an auxiliary to be used before IlvGrapher.write(IlvOutputStream) if you want to store layout parameter settings in .ivl files.

If you create your own subclass of IlvGraphLayout and want to save the layout parameters of your subclass for individual links in .ivl files, you need to create a subclass of this class. The subclass must provide a constructor with your IlvGraphLayout subclass and the link as input, and transfer the layout parameters of the link from the input layout to the property. It must also override the transfer method to transfer the layout parameters from the property back to the layout instance.

Further information about subclassing can be found in the documentation of IlvNamedProperty.

As an example, assume that your subclass MyLayout of IlvGraphLayout has a string parameter for each link that can be accessed by getMyParameter and set by setMyParameter. You can create a named property that can store this parameter in the following way:

 public class MyLayoutLinkProperty extends IlvGraphLayoutLinkProperty
 { 
  String myParameter;
 
  public MyLayoutLinkProperty(
    String name, MyLayout layout, IlvGraphic link, boolean withDefaults)
  {
    super(name, layout, link, withDefaults);
    this.myParameter = layout.getMyParameter(link);
  }

  public MyLayoutLinkProperty(MyLayoutLinkProperty source)
  {
    super(source);
    this.myParameter = source.myParameter;
  }
 
  public MyLayoutLinkProperty(IlvInputStream stream)
    throws IOException, IlvReadFileException
  {
    super(stream);
    try {
      this.myParameter = stream.readString("myParameter");
    } catch (IlvFieldNotFoundException e) {
      this.myParameter = myParameterDefaultValue;
    }
  } 

  public IlvNamedProperty copy()
  {
    return new MyLayoutLinkProperty(this);
  }

  public void write(IlvOutputStream stream) throws IOException
  {
    super.write(stream);
    stream.write("myParameter", this.myParameter);
  }

  public void transfer(IlvGraphLayout layout, IlvGraphic link)
  {
    super.transfer(layout, link);
    ((MyLayout)layout).setMyParameter(link, this.myParameter);
  }

  public boolean isPersistent()
  {
    // this will catch the case that omitDefaults is false
    if (super.isPersistent())
      return true;

    // in case omitDefaults is true:
    if (this.myParameter != myParameterDefaultValue)
      return true;
    return false;
  }
 }
 

Note that MyLayout must override IlvGraphLayout.createLayoutLinkProperty(String, IlvGraphic, boolean) to return an instance of your new class MyLayoutLinkProperty.

Since:

JViews 3.5

See Also:

IlvGrapherPropertyAdapter.saveParametersToNamedProperties(IlvGraphLayout, boolean), IlvGrapherPropertyAdapter.loadParametersFromNamedProperties(IlvGraphLayout), IlvGrapherPropertyAdapter.removeParametersFromNamedProperties(), Serialized Form

Constructor Summary

Constructors

Modifier	Constructor and Description
	IlvGraphLayoutLinkProperty(IlvGraphLayoutLinkProperty source) Creates a new IlvGraphLayoutLinkProperty by copying an existing one.
	IlvGraphLayoutLinkProperty(IlvInputStream stream) Creates a new IlvGraphLayoutLinkProperty from an IlvInputStream.
protected	IlvGraphLayoutLinkProperty(IlvInputStream stream, boolean fromSubclass) Creates a new IlvGraphLayoutLinkProperty from an IlvInputStream.
	IlvGraphLayoutLinkProperty(String name, IlvGraphLayout layout, IlvGraphic link, boolean withDefaults) Creates a new IlvGraphLayoutLinkProperty that stores layout parameter settings of the layout for the link.

Method Summary

Modifier and Type	Method and Description
IlvNamedProperty	copy() Copies the named property.
void	dispose(IlvGrapherAdapter adapter) Deprecated. Since JViews 8.8, use dispose(IlvGrapherPropertyAdapter).
void	dispose(IlvGrapherPropertyAdapter adapter) Disposes of the property and releases any resources that it is using.
protected IlvGraphLayout	getLayout() Returns the layout instance that created this property.
boolean	isPersistent() Returns true if the property must be saved to an .ivl file.
protected boolean	isWritten(IlvGraphic nodeOrLink) Returns true if the writing of the input node or link was completed.
protected boolean	omitDefaults() Returns true if the layout property is not persistent when all stored parameter values are default values.
protected boolean	readProperties(IlvInputStream stream) Reads the properties from an IlvInputStream.
void	transfer(IlvGraphLayout layout, IlvGraphic link) Transfers the layout parameter settings stored in this named property back to the input layout for the input link.
void	write(IlvOutputStream stream) Writes the property to the output stream.

Methods inherited from class ilog.views.IlvNamedProperty

getName

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

IlvGraphLayoutLinkProperty

public IlvGraphLayoutLinkProperty(String name,
                                  IlvGraphLayout layout,
                                  IlvGraphic link,
                                  boolean withDefaults)

Creates a new IlvGraphLayoutLinkProperty that stores layout parameter settings of the layout for the link.

Parameters:

name - The name of the property.

layout - The layout instance to be stored.

link - The link whose layout parameters are to be stored.

withDefaults - If true, the layout property is always persistent. If false, it is persistent only if nondefault parameter settings exist (that is, if the the property is saved to an .ivl file, the default parameter settings are not saved).

IlvGraphLayoutLinkProperty

public IlvGraphLayoutLinkProperty(IlvGraphLayoutLinkProperty source)

Creates a new IlvGraphLayoutLinkProperty by copying an existing one.

Parameters:

source - The origin of the copy.

IlvGraphLayoutLinkProperty

public IlvGraphLayoutLinkProperty(IlvInputStream stream)
                           throws IOException,
                                  IlvReadFileException

Creates a new IlvGraphLayoutLinkProperty from an IlvInputStream.

Parameters:

stream - The input stream from which the property must be read.

Throws:

IlvReadFileException - if an error occurs while reading.

IOException

IlvGraphLayoutLinkProperty

protected IlvGraphLayoutLinkProperty(IlvInputStream stream,
                                     boolean fromSubclass)
                              throws IOException,
                                     IlvReadFileException

Creates a new IlvGraphLayoutLinkProperty from an IlvInputStream. This method is for internal purpose.

Parameters:

stream - The input stream from which the property must be read.

fromSubclass - Whether this constructor is called from a subclass.

Throws:

IlvReadFileException - if an error occurs while reading.

IOException

Since:

JViews 8.8

Method Detail

readProperties

protected boolean readProperties(IlvInputStream stream)
                          throws IOException,
                                 IlvReadFileException

Reads the properties from an IlvInputStream. This method is for internal purpose.

Parameters:

stream - The input stream from which the property must be read.

Throws:

IlvReadFileException - if an error occurs while reading.

IOException

Since:

JViews 8.8

getLayout

protected IlvGraphLayout getLayout()

Returns the layout instance that created this property. If the property was created by reading from IlvInputStream, it returns null.

omitDefaults

protected boolean omitDefaults()

Returns true if the layout property is not persistent when all stored parameter values are default values. Returns false if the layout property is persistent independent of default values. If the property was created by reading from IlvInputStream, it returns false.

copy

public IlvNamedProperty copy()

Copies the named property.

Specified by:

copy in class IlvNamedProperty

isPersistent

public boolean isPersistent()

Returns true if the property must be saved to an .ivl file.

Specified by:

isPersistent in class IlvNamedProperty

isWritten

protected boolean isWritten(IlvGraphic nodeOrLink)

Returns true if the writing of the input node or link was completed.

If customers need to subclass this class, this auxiliary can be used inside the implementation of the write method only. For instance, it can be used if information must be written depending on whether another node or another link has already been written.

Parameters:

nodeOrLink - A node or link of the same grapher.

Returns:

true if the node or link has been written before this property.

See Also:

write(IlvOutputStream)

write

public void write(IlvOutputStream stream)
           throws IOException

Writes the property to the output stream.

Specified by:

write in interface IlvPersistentObject

Overrides:

write in class IlvNamedProperty

Parameters:

stream - The output stream.

Throws:

IOException - standard IO error.

transfer

public void transfer(IlvGraphLayout layout,
                     IlvGraphic link)

Transfers the layout parameter settings stored in this named property back to the input layout for the input link.

Parameters:

layout - The layout instance whose parameters are to be recovered from this named property.

link - The link whose layout parameters are to be recovered from this named property.

dispose

public void dispose(IlvGrapherPropertyAdapter adapter)

Disposes of the property and releases any resources that it is using. This is called if the property was loaded and removed from the grapher.

Parameters:

adapter - The grapher property adapter.

Since:

JViews 8.8

See Also:

IlvGrapherPropertyAdapter.loadParametersFromNamedProperties(IlvGraphLayout), IlvGrapherPropertyAdapter.removeParametersFromNamedProperties()

dispose

public void dispose(IlvGrapherAdapter adapter)

Deprecated. Since JViews 8.8, use dispose(IlvGrapherPropertyAdapter).

Disposes of the property and releases any resources that it is using. This is called if the property was loaded and removed from the grapher.

Parameters:

adapter - The grapher adapter.

Since:

JViews 5.0